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森林净初级生产力(NPP)是衡量陆地碳源/汇的重要参数,准确地估算森林生态系统的NPP,同时通过引入干扰因子以期更加完整地描述生态学过程及其响应是目前森林生态系统碳循环研究的重点。因此,该研究基于北方生态系统生产力(BEPS)模型,结合遥感数据和气象数据等模拟2003年东北林区NPP;将BEPS模型模拟的结果作为整合陆地生态系统碳收支(In TEC)模型的参考年数据,模拟东北林区1901–2008年的NPP,并在In TEC模型中加入林火干扰数据,模拟大兴安岭地区1966–2008年的森林NPP。结果显示:在1901年,东北林区NPP平均值仅为278.8 g C·m–2·a–1,到了1950年,NPP平均值增加到338.5 g C·m–2·a–1,2008年NPP平均值进一步增加到378.4 g C·m–2·a–1。其中长白山地区的NPP平均值始终最高,大兴安岭次之,小兴安岭始终最低。到了2008年,大、小兴安岭和长白山地区的NPP平均值都有较大涨幅,其中涨幅最高的是长白山地区,达到200–300 g C·m–2·a–1;东北三省中,黑龙江和吉林的NPP平均值和总量都比较高,辽宁相对较低,但相比于1901年的涨幅最高,达到70%;重大火灾(100–1000 hm2)对NPP的影响不是很大,而特大火灾(>1 000 hm2)的影响比较大,使NPP下降幅度达到10%左右,其他火灾年份,NPP增长迅速并保持在较高水平;对火灾面积在100 000 hm2以上的4个年份的NPP进行分析,发现NPP平均值都大幅度下降,其中1987年下降幅度最大,为11%以上。
Net Primary Productivity of Forests (NPP) is an important parameter for measuring terrestrial carbon sources / sinks and accurately estimates the NPP of forest ecosystems. At the same time, introducing a disturbance factor to describe the ecological process more completely and its response is the current carbon cycle of forest ecosystems The focus of the research. Therefore, based on the North Ecosystem Productivity (BEPS) model and the remote sensing data and meteorological data, the study simulated the NPP in 2003 in Northeast China. The results of the BEPS model simulation were used as a reference to integrate the InCe model of terrestrial ecosystems Year data to simulate the NPP from 1901 to 2008 in the forest region of Northeast China. The forest fire disturbance data were added to the In TEC model to simulate the forest NPP from 1966 to 2008 in the Greater Xing’an Mountains. The results showed that in 1901, the average NPP in the forest area of Northeast China was only 278.8 g C · m -2 · a -1. By 1950, the NPP average increased to 338.5 g C m -2 · a -1 The average NPP further increased to 378.4 g C · m-2 · a-1. Among them, the average NPP in Changbai Mountain area is always the highest, followed by the Greater Xing’an Mountains and the lowest in Xing’an Mountains. By 2008, the average NPP of the Greater and Xiaoxing’an Mountains and Changbai Mountains had a larger increase, with the highest increase being in Changbai Mountain area reaching 200-300 g C · m-2 · a-1; among the three northeastern provinces, Heilongjiang and Jilin NPP average and total amount are relatively high, Liaoning is relatively low, but the highest rate of increase compared to 1901, reaching 70%; major fires (100-1000 hm2) on the impact of NPP is not large, and the extra-large fire > 1 000 hm2), the NPP decreased by about 10%. In other years of fire, the NPP increased rapidly and remained at a relatively high level. NPP in four years with a fire area above 100 000 hm2 was analyzed, Found that the average NPP dropped significantly, of which the largest decline in 1987, more than 11%.